The skiing world is embroiled in a ‘blood doping’ scandal.

‘Blood Doping’ is when an athlete injects oxygenated blood into themselves, in an attempt to improve their athletic performance. According to the World Anti-Doping Agency, dopers do it to increase their red blood cell mass, which means the body can then transport more oxygen to the muscles. This, in turn, increases an athlete’s stamina.

Graphic footage has been leaked showing Austrian cross-country skier Max Hauke giving himself a blood transfusion. He was one of five athletes arrested in Seefeld-Austria, which is hosting the Nordic World Ski Championships.

The arrests have sent shockwaves through the skiing world, and have happened right in the middle of one of its biggest global competitions.